ref(tracing): Restore ability to have tracing disabled #991
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This PR partially reverts #948 and 6fc2287, to restore the ability to disable tracing, which allows it to truly be opt-in as per the spec.
Note that this does not change the behavior that PR was made to reinstate - the model wherein the front end makes sampling decisions, the backend has
traces_sample_rateset to0, and the result is that the backend samples according to the front end decision when there is one, but otherwise does not send transactions. (That PR modified a test to test for that exact scenario, and it still passes.)